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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: VersionFunction.html 602 2015-01-05 18:49:18Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.parse.func;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import org.jsimpledb.JObject;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import org.jsimpledb.core.DeletedObjectException;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import org.jsimpledb.core.ObjId;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.parse.ParseSession;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.jsimpledb.parse.expr.ConstValue;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.jsimpledb.parse.expr.EvalException;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.parse.expr.Value;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>@Function<a name="line.18"></a>
<span class="sourceLineNo">019</span>public class VersionFunction extends SimpleFunction {<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>    public VersionFunction() {<a name="line.21"></a>
<span class="sourceLineNo">022</span>        super("version", 1, 1);<a name="line.22"></a>
<span class="sourceLineNo">023</span>    }<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    @Override<a name="line.25"></a>
<span class="sourceLineNo">026</span>    public String getUsage() {<a name="line.26"></a>
<span class="sourceLineNo">027</span>        return "version(object)";<a name="line.27"></a>
<span class="sourceLineNo">028</span>    }<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>    @Override<a name="line.30"></a>
<span class="sourceLineNo">031</span>    public String getHelpSummary() {<a name="line.31"></a>
<span class="sourceLineNo">032</span>        return "returns the schema version of an object";<a name="line.32"></a>
<span class="sourceLineNo">033</span>    }<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>    @Override<a name="line.35"></a>
<span class="sourceLineNo">036</span>    protected Value apply(ParseSession session, Value[] params) {<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>        // Get object<a name="line.38"></a>
<span class="sourceLineNo">039</span>        Object obj = params[0].checkNotNull(session, "version()");<a name="line.39"></a>
<span class="sourceLineNo">040</span>        if (obj instanceof JObject)<a name="line.40"></a>
<span class="sourceLineNo">041</span>            obj = ((JObject)obj).getObjId();<a name="line.41"></a>
<span class="sourceLineNo">042</span>        else if (!(obj instanceof ObjId))<a name="line.42"></a>
<span class="sourceLineNo">043</span>            throw new EvalException("invalid version() operation on non-database object of type " + obj.getClass().getName());<a name="line.43"></a>
<span class="sourceLineNo">044</span>        final ObjId id = (ObjId)obj;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>        // Return version<a name="line.46"></a>
<span class="sourceLineNo">047</span>        try {<a name="line.47"></a>
<span class="sourceLineNo">048</span>            return new ConstValue(session.getTransaction().getSchemaVersion(id));<a name="line.48"></a>
<span class="sourceLineNo">049</span>        } catch (DeletedObjectException e) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>            throw new EvalException("invalid version() operation on non-existent object " + id);<a name="line.50"></a>
<span class="sourceLineNo">051</span>        }<a name="line.51"></a>
<span class="sourceLineNo">052</span>    }<a name="line.52"></a>
<span class="sourceLineNo">053</span>}<a name="line.53"></a>
<span class="sourceLineNo">054</span><a name="line.54"></a>




























































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